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Instrumentation
Dr. Xiaofeng Wu
Instrumentation (AMME2700)
1
Units
Instrumentation (AMME2700)
2
Unit of Energy
Instrumentation (AMME2700)
3
Passive Convention
Instrumentation (AMME2700)
Kirchhoff’s Circuit Laws
 Kirchhoff’s current law (KCL)
i  0
 Kirchhoff’s voltage law (KVL)
v  0
Instrumentation (AMME2700)
Example 1
In the figure below R1 = 8Ω and It is desired
that the output power absorbed by R1 be
4.5W. Find the voltage vo and the required
source vs.
Instrumentation (AMME2700)
Resistive Circuits
 Series Resistors
Re  R1  R2
 Parallel Resistors
1
1
1
1
 

Re R1 R2 R3
Instrumentation (AMME2700)
Voltage Divider (for series resistors)
vn 
Rn
i
R
n 1
R1
R2
Ri
v1
v2
vi
vs
n
i
Determine the voltage measured by the voltmeter.
Instrumentation (AMME2700)
Current Divider (for parallel resistors)
1
R
in  i n is
1

n 1 Rn
i1
is
R1
Instrumentation (AMME2700)
v1
ii
R2
v2
Ri
vi
Current Divider
Determine the current measured by the Ammeter.
Instrumentation (AMME2700)
Analyzing Resistive Circuits using
Matlab
 Determine the values of resistor currents.
(example 3.7-1)
Instrumentation (AMME2700)